.NET Framework Class Library
WebPart Class

Serves as the base class for custom ASP.NET Web Parts controls, adding to the base Part class features some additional user interface (UI) properties, the ability to create connections, and personalization behavior.

Namespace:   System.Web.UI.WebControls.WebParts
Assembly:  System.Web (in System.Web.dll)
Syntax
Public MustInherit Class WebPart _
	Inherits [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_0_0_0%] _
	Implements [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_0_0_1%], [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_0_0_2%], [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_0_0_3%]
public abstract class WebPart : [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_1_0_0%], 
	[%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_1_0_1%], [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_1_0_2%], [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_1_0_3%]
public ref class WebPart abstract : public [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_2_0_0%], 
	[%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_2_0_1%], [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_2_0_2%], [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_2_0_3%]
[<[%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_3_0_0%]>]
type WebPart =  
    class 
        inherit [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_3_0_1%] 
        interface [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_3_0_2%] 
        interface [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_3_0_3%] 
        interface [%$TOPIC/h0t1fxe7_en-us_VS_110_3_0_3_0_4%] 
    end
<asp:WebPart />

The WebPart type exposes the following members.

Constructors
  NameDescription
Protected method WebPartInitializes the class for use by an inherited class instance. This constructor can only be called by an inherited class.
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Properties
  NameDescription
Public property AccessKeyGets or sets the access key that allows you to quickly navigate to the Web server control. (Inherited from WebControl.)
Protected property AdapterGets the browser-specific adapter for the control. (Inherited from Control.)
Public property AllowCloseGets or sets a value indicating whether an end user can close a WebPart control on a Web page.
Public property AllowConnectGets or sets a value that indicates whether the WebPart control allows other controls to form connections with it.
Public property AllowEditGets or sets a value indicating whether an end user can modify a WebPart control through the user interface (UI) provided by one or more EditorPart controls.
Public property AllowHideGets or sets a value indicating whether end users are allowed to hide a WebPart control.
Public property AllowMinimizeGets or sets a value indicating whether end users can minimize a WebPart control.
Public property AllowZoneChangeGets or sets a value indicating whether a user can move a WebPart control between WebPartZoneBase zones.
Public property AppRelativeTemplateSourceDirectoryGets or sets the application-relative virtual directory of the Page or UserControl object that contains this control. (Inherited from Control.)
Public property AttributesGets the collection of arbitrary attributes (for rendering only) that do not correspond to properties on the control. (Inherited from WebControl.)
Public property AuthorizationFilterGets or sets an arbitrary string to determine whether a WebPart control is authorized to be added to a page.
Public property BackColorGets or sets the background color of the Web server control. (Inherited from WebControl.)
Public property BackImageUrlGets or sets the URL of the background image for the panel control. (Inherited from Panel.)
Public property BindingContainerInfrastructure. Gets the control that contains this control's data binding. (Inherited from Control.)
Public property BorderColorGets or sets the border color of the Web control. (Inherited from WebControl.)
Public property BorderStyleGets or sets the border style of the Web server control. (Inherited from WebControl.)
Public property BorderWidthGets or sets the border width of the Web server control. (Inherited from WebControl.)
Public property CatalogIconImageUrlGets or sets the URL to an image that represents a Web Parts control in a catalog of controls.
Protected property ChildControlsCreatedGets a value that indicates whether the server control's child controls have been created. (Inherited from Control.)
Public property ChromeStateGets or sets whether a part control is in a minimized or normal state. (Overrides PartChromeState.)
Public property ChromeTypeGets or sets the type of border that frames a Web Parts control. (Overrides PartChromeType.)
Public property ClientIDGets the control ID for HTML markup that is generated by ASP.NET. (Inherited from Control.)
Public property ClientIDModeGets or sets the algorithm that is used to generate the value of the ClientID property. (Inherited from Control.)
Protected property ClientIDSeparatorGets a character value representing the separator character used in the ClientID property. (Inherited from Control.)
Public property ConnectErrorMessageGets an error message to display to users if errors occur during the connection process.
Protected property ContextGets the HttpContext object associated with the server control for the current Web request. (Inherited from Control.)
Public property ControlsInfrastructure. Gets a ControlCollection object that contains the child controls for a specified server control in the user interface hierarchy. (Inherited from Part.)
Public property ControlStyleGets the style of the Web server control. This property is used primarily by control developers. (Inherited from WebControl.)
Public property ControlStyleCreatedGets a value indicating whether a Style object has been created for the ControlStyle property. This property is primarily used by control developers. (Inherited from WebControl.)
Public property CssClassGets or sets the Cascading Style Sheet (CSS) class rendered by the Web server control on the client. (Inherited from WebControl.)
Public property DataItemContainerGets a reference to the naming container if the naming container implements IDataItemContainer. (Inherited from Control.)
Public property DataKeysContainerGets a reference to the naming container if the naming container implements IDataKeysControl. (Inherited from Control.)
Public property DefaultButtonGets or sets the identifier for the default button that is contained in the Panel control. (Inherited from Panel.)
Public property DescriptionGets or sets a brief phrase that summarizes what the part control does, for use in ToolTips and catalogs of part controls. (Overrides PartDescription.)
Protected property DesignModeGets a value indicating whether a control is being used on a design surface. (Inherited from Control.)
Public property DirectionGets or sets the horizontal direction that content flows within the control. (Overrides PanelDirection.)
Public property DisplayTitleGets a string that contains the full title text actually displayed in the title bar of a WebPart control instance.
Public property EnabledGets or sets a value indicating whether the Web server control is enabled. (Inherited from WebControl.)
Public property EnableThemingGets or sets a value indicating whether themes apply to this control. (Inherited from WebControl.)
Public property EnableViewStateGets or sets a value indicating whether the server control persists its view state, and the view state of any child controls it contains, to the requesting client. (Inherited from Control.)
Protected property EventsGets a list of event handler delegates for the control. This property is read-only. (Inherited from Control.)
Public property ExportModeGets or sets whether all, some, or none of a WebPart control's properties can be exported.
Public property FontGets the font properties associated with the Web server control. (Inherited from WebControl.)
Public property ForeColorGets or sets the foreground color (typically the color of the text) of the Web server control. (Inherited from WebControl.)
Public property GroupingTextGets or sets the caption for the group of controls that is contained in the panel control. (Inherited from Panel.)
Public property HasAttributesGets a value indicating whether the control has attributes set. (Inherited from WebControl.)
Protected property HasChildViewStateGets a value indicating whether the current server control's child controls have any saved view-state settings. (Inherited from Control.)
Public property HasSharedDataGets a value that indicates whether a WebPart control has any shared personalization data associated with it.
Public property HasUserDataGets a value that indicates whether a WebPart control has any user personalization data associated with it.
Public property HeightGets or sets the height of a zone. (Overrides WebControlHeight.)
Public property HelpModeGets or sets the type of user interface (UI) used to display Help content for a WebPart control.
Public property HelpUrlGets or sets the URL to a Help file for a WebPart control.
Public property HiddenGets or sets a value indicating whether a WebPart control is displayed on a Web page.
Public property HorizontalAlignGets or sets the horizontal alignment of the contents within the panel. (Inherited from Panel.)
Public property IDGets or sets the programmatic identifier assigned to the server control. (Inherited from Control.)
Protected property IdSeparatorInfrastructure. Gets the character used to separate control identifiers. (Inherited from Control.)
Public property ImportErrorMessageGets or sets an error message that is used if errors occur when a WebPart control is imported.
Protected property IsChildControlStateClearedGets a value indicating whether controls contained within this control have control state. (Inherited from Control.)
Public property IsClosedGets a value that indicates whether a WebPart control is currently closed on a Web Parts page.
Protected property IsEnabledGets a value indicating whether the control is enabled. (Inherited from WebControl.)
Public property IsSharedGets a value that indicates whether a WebPart control is shared, meaning that it is visible to all users of a Web Parts page.
Public property IsStandaloneGets a value that indicates whether a WebPart control is standalone, meaning that it is not contained within a WebPartZoneBase zone.
Public property IsStaticGets a value that indicates whether a WebPart control is a static control, which means the control is declared in the markup of a Web Parts page and not added to the page programmatically.
Protected property IsTrackingViewStateGets a value that indicates whether the server control is saving changes to its view state. (Inherited from Control.)
Protected property IsViewStateEnabledGets a value indicating whether view state is enabled for this control. (Inherited from Control.)
Protected property LoadViewStateByIDGets a value indicating whether the control participates in loading its view state by ID instead of index. (Inherited from Control.)
Public property NamingContainerGets a reference to the server control's naming container, which creates a unique namespace for differentiating between server controls with the same ControlID property value. (Inherited from Control.)
Public property PageGets a reference to the Page instance that contains the server control. (Inherited from Control.)
Public property ParentGets a reference to the server control's parent control in the page control hierarchy. (Inherited from Control.)
Public property RenderingCompatibilityGets a value that specifies the ASP.NET version that rendered HTML will be compatible with. (Inherited from Control.)
Public property ScrollBarsGets or sets the visibility and position of scroll bars in a Panel control. (Inherited from Panel.)
Public property SiteGets information about the container that hosts the current control when rendered on a design surface. (Inherited from Control.)
Public property SkinIDGets or sets the skin to apply to the control. (Inherited from WebControl.)
Public property StyleGets a collection of text attributes that will be rendered as a style attribute on the outer tag of the Web server control. (Inherited from WebControl.)
Public property SubtitleGets a string that is concatenated with the Title property value to form a complete title for a WebPart control.
Public property SupportsDisabledAttributeGets a value that indicates whether the control should set the disabled attribute of the rendered HTML element to "disabled" when the control's IsEnabled property is false. (Inherited from Panel.)
Public property TabIndexGets or sets the tab index of the Web server control. (Inherited from WebControl.)
Protected property TagKeyGets the HtmlTextWriterTag value that corresponds to this Web server control. This property is used primarily by control developers. (Inherited from WebControl.)
Protected property TagNameGets the name of the control tag. This property is used primarily by control developers. (Inherited from WebControl.)
Public property TemplateControlGets or sets a reference to the template that contains this control. (Inherited from Control.)
Public property TemplateSourceDirectoryGets the virtual directory of the Page or UserControl that contains the current server control. (Inherited from Control.)
Public property TitleGets or sets the title of a part control. (Overrides PartTitle.)
Public property TitleIconImageUrlGets or sets the URL to an image used to represent a Web Parts control in the control's title bar.
Public property TitleUrlGets or sets a URL to supplemental information about a WebPart control.
Public property ToolTipGets or sets the text displayed when the mouse pointer hovers over the Web server control. (Inherited from WebControl.)
Public property UniqueIDGets the unique, hierarchically qualified identifier for the server control. (Inherited from Control.)
Public property ValidateRequestModeGets or sets a value that indicates whether the control checks client input from the browser for potentially dangerous values. (Inherited from Control.)
Public property VerbsGets a collection of custom verbs associated with a WebPart control.
Protected property ViewStateGets a dictionary of state information that allows you to save and restore the view state of a server control across multiple requests for the same page. (Inherited from Control.)
Protected property ViewStateIgnoresCaseGets a value that indicates whether the StateBag object is case-insensitive. (Inherited from Control.)
Public property ViewStateModeGets or sets the view-state mode of this control. (Inherited from Control.)
Public property VisibleGets or sets a value that indicates whether a server control is rendered as UI on the page. (Inherited from Control.)
Public property WebBrowsableObjectGets a reference to the WebPart control to enable it to be edited by custom EditorPart controls.
Protected property WebPartManagerGets a reference to the WebPartManager control associated with a WebPart control instance.
Public property WidthGets or sets the width of the Web server control. (Overrides WebControlWidth.)
Public property WrapGets or sets a value indicating whether the content wraps within the panel. (Inherited from Panel.)
Public property ZoneGets the WebPartZoneBase zone that currently contains a WebPart control.
Public property ZoneIndexGets the index position of a WebPart control within its zone.
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Methods
  NameDescription
Protected method AddAttributesToRenderAdds information about the background image, alignment, wrap, and direction to the list of attributes to render. (Inherited from Panel.)
Protected method AddedControlCalled after a child control is added to the Controls collection of the Control object. (Inherited from Control.)
Protected method AddParsedSubObjectNotifies the server control that an element, either XML or HTML, was parsed, and adds the element to the server control's ControlCollection object. (Inherited from Control.)
Public method ApplyStyleCopies any nonblank elements of the specified style to the Web control, overwriting any existing style elements of the control. This method is primarily used by control developers. (Inherited from WebControl.)
Public method ApplyStyleSheetSkinApplies the style properties defined in the page style sheet to the control. (Inherited from Control.)
Protected method BeginRenderTracingBegins design-time tracing of rendering data. (Inherited from Control.)
Protected method BuildProfileTreeInfrastructure. Gathers information about the server control and delivers it to the Trace property to be displayed when tracing is enabled for the page. (Inherited from Control.)
Protected method ClearCachedClientIDInfrastructure. Sets the cached ClientID value to . (Inherited from Control.)
Protected method ClearChildControlStateDeletes the control-state information for the server control's child controls. (Inherited from Control.)
Protected method ClearChildStateDeletes the view-state and control-state information for all the server control's child controls. (Inherited from Control.)
Protected method ClearChildViewStateDeletes the view-state information for all the server control's child controls. (Inherited from Control.)
Protected method ClearEffectiveClientIDModeInfrastructure. Sets the ClientIDMode property of the current control instance and of any child controls to Inherit. (Inherited from Control.)
Public method CopyBaseAttributesCopies the properties not encapsulated by the Style object from the specified Web server control to the Web server control that this method is called from. This method is used primarily by control developers. (Inherited from WebControl.)
Protected method CreateChildControlsCalled by the ASP.NET page framework to notify server controls that use composition-based implementation to create any child controls they contain in preparation for posting back or rendering. (Inherited from Control.)
Protected method CreateControlCollectionCreates a new ControlCollection object to hold the child controls (both literal and server) of the server control. (Inherited from Control.)
Protected method CreateControlStyleCreates a style object that is used internally by the Panel control to implement all style related properties. (Inherited from Panel.)
Public method CreateEditorPartsReturns a collection of custom EditorPart controls that can be used to edit a WebPart control when it is in edit mode.
Public method DataBindBinds a data source to the invoked server control and all its child controls. (Inherited from Part.)
Protected method DataBind(Boolean)Binds a data source to the invoked server control and all its child controls with an option to raise the DataBinding event. (Inherited from Control.)
Protected method DataBindChildrenBinds a data source to the server control's child controls. (Inherited from Control.)
Public method DisposeEnables a server control to perform final clean up before it is released from memory. (Inherited from Control.)
Protected method EndRenderTracingEnds design-time tracing of rendering data. (Inherited from Control.)
Protected method EnsureChildControlsDetermines whether the server control contains child controls. If it does not, it creates child controls. (Inherited from Control.)
Protected method EnsureIDCreates an identifier for controls that do not have an identifier assigned. (Inherited from Control.)
Public method Equals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected method FinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method FindControl(String)Searches the current naming container for a server control with the specified id parameter. (Inherited from Control.)
Protected method FindControl(String, Int32)Infrastructure. Searches the current naming container for a server control with the specified id and an integer, specified in the pathOffset parameter, which aids in the search. You should not override this version of the FindControl method. (Inherited from Control.)
Public method FocusSets input focus to a control. (Inherited from Control.)
Protected method GetDesignModeStateInfrastructure. Gets design-time data for a control. (Inherited from Control.)
Public method GetHashCodeServes as the default hash function. (Inherited from Object.)
Public method GetRouteUrl(Object)Gets the URL that corresponds to a set of route parameters. (Inherited from Control.)
Public method GetRouteUrl(RouteValueDictionary)Gets the URL that corresponds to a set of route parameters. (Inherited from Control.)
Public method GetRouteUrl(String, Object)Gets the URL that corresponds to a set of route parameters and a route name. (Inherited from Control.)
Public method GetRouteUrl(String, RouteValueDictionary)Gets the URL that corresponds to a set of route parameters and a route name. (Inherited from Control.)
Public method GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method GetUniqueIDRelativeToReturns the prefixed portion of the UniqueID property of the specified control. (Inherited from Control.)
Public method HasControlsDetermines if the server control contains any child controls. (Inherited from Control.)
Protected method HasEventsReturns a value indicating whether events are registered for the control or any child controls. (Inherited from Control.)
Protected method IsLiteralContentInfrastructure. Determines if the server control holds only literal content. (Inherited from Control.)
Protected method LoadControlStateRestores control-state information from a previous page request that was saved by the SaveControlState method. (Inherited from Control.)
Protected method LoadViewStateRestores view-state information from a previous request that was saved with the SaveViewState method. (Inherited from WebControl.)
Protected method MapPathSecureRetrieves the physical path that a virtual path, either absolute or relative, maps to. (Inherited from Control.)
Protected method MemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public method MergeStyleCopies any nonblank elements of the specified style to the Web control, but will not overwrite any existing style elements of the control. This method is used primarily by control developers. (Inherited from WebControl.)
Protected method OnBubbleEventDetermines whether the event for the server control is passed up the page's UI server control hierarchy. (Inherited from Control.)
Protected method OnClosingEnables derived classes to provide custom handling when a WebPart control is closed on a Web Parts page.
Protected method OnConnectModeChangedEnables derived classes to provide custom handling when a WebPart control is beginning or ending the process of connecting to other controls.
Protected method OnDataBindingRaises the DataBinding event. (Inherited from Control.)
Protected method OnDeletingEnables derived classes to provide custom handling when a WebPart control is permanently removed from a Web Parts page.
Protected method OnEditModeChangedEnables derived classes to provide custom handling when a WebPart control is entering or leaving edit mode.
Protected method OnInitRaises the Init event. (Inherited from Control.)
Protected method OnLoadRaises the Load event. (Inherited from Control.)
Protected method OnPreRenderRaises the PreRender event. (Inherited from Control.)
Protected method OnUnloadRaises the Unload event. (Inherited from Control.)
Protected method OpenFileGets a Stream used to read a file. (Inherited from Control.)
Protected method RaiseBubbleEventAssigns any sources of the event and its information to the control's parent. (Inherited from Control.)
Protected method RemovedControlCalled after a child control is removed from the Controls collection of the Control object. (Inherited from Control.)
Protected method RenderRenders the control to the specified HTML writer. (Inherited from WebControl.)
Public method RenderBeginTagRenders the HTML opening tag of the Panel control to the specified writer. (Inherited from Panel.)
Protected method RenderChildrenOutputs the content of a server control's children to a provided HtmlTextWriter object, which writes the content to be rendered on the client. (Inherited from Control.)
Protected method RenderContentsRenders the contents of the control to the specified writer. This method is used primarily by control developers. (Inherited from WebControl.)
Public method RenderControl(HtmlTextWriter)Outputs server control content to a provided HtmlTextWriter object and stores tracing information about the control if tracing is enabled. (Inherited from Control.)
Protected method RenderControl(HtmlTextWriter, ControlAdapter)Outputs server control content to a provided HtmlTextWriter object using a provided ControlAdapter object. (Inherited from Control.)
Public method RenderEndTagRenders the HTML closing tag of the Panel control into the specified writer. (Inherited from Panel.)
Protected method ResolveAdapterGets the control adapter responsible for rendering the specified control. (Inherited from Control.)
Public method ResolveClientUrlGets a URL that can be used by the browser. (Inherited from Control.)
Public method ResolveUrlConverts a URL into one that is usable on the requesting client. (Inherited from Control.)
Protected method SaveControlStateSaves any server control state changes that have occurred since the time the page was posted back to the server. (Inherited from Control.)
Protected method SaveViewStateSaves any state that was modified after the TrackViewState method was invoked. (Inherited from WebControl.)
Protected method SetDesignModeStateSets design-time data for a control. (Inherited from Control.)
Protected method SetPersonalizationDirtySets a flag indicating that personalization data has changed for the current WebPart control instance.
Public method Static member SetPersonalizationDirty(Control)Sets a flag indicating that personalization data has changed for the specified server control that resides in a WebPartZoneBase zone.
Public method SetRenderMethodDelegateInfrastructure. Assigns an event handler delegate to render the server control and its content into its parent control. (Inherited from Control.)
Public method SetTraceData(Object, Object)Sets trace data for design-time tracing of rendering data, using the trace data key and the trace data value. (Inherited from Control.)
Public method SetTraceData(Object, Object, Object)Sets trace data for design-time tracing of rendering data, using the traced object, the trace data key, and the trace data value. (Inherited from Control.)
Public method ToStringReturns a string that represents the current object. (Inherited from Object.)
Protected method TrackViewStateCauses the control to track changes to its view state so they can be stored in the object's ViewState property. (Overrides WebControlTrackViewState.)
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Events
  NameDescription
Public event DataBindingOccurs when the server control binds to a data source. (Inherited from Control.)
Public event DisposedOccurs when a server control is released from memory, which is the last stage of the server control lifecycle when an ASP.NET page is requested. (Inherited from Control.)
Public event InitOccurs when the server control is initialized, which is the first step in its lifecycle. (Inherited from Control.)
Public event LoadOccurs when the server control is loaded into the Page object. (Inherited from Control.)
Public event PreRenderOccurs after the Control object is loaded but prior to rendering. (Inherited from Control.)
Public event UnloadOccurs when the server control is unloaded from memory. (Inherited from Control.)
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Extension Methods
  NameDescription
Public Extension Method FindDataSourceControlReturns the data source that is associated with the data control for the specified control. (Defined by DynamicDataExtensions.)
Public Extension Method FindFieldTemplateReturns the field template for the specified column in the specified control's naming container. (Defined by DynamicDataExtensions.)
Public Extension Method FindMetaTableReturns the metatable object for the containing data control. (Defined by DynamicDataExtensions.)
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Explicit Interface Implementations
  NameDescription
Explicit interface implemetation Private method IAttributeAccessorGetAttributeInfrastructure. Gets an attribute of the Web control with the specified name. (Inherited from WebControl.)
Explicit interface implemetation Private method IAttributeAccessorSetAttributeSets an attribute of the Web control to the specified name and value. (Inherited from WebControl.)
Explicit interface implemetation Private method ICompositeControlDesignerAccessorRecreateChildControlsAllows the developer of a designer for a composite part control to recreate the control's child controls on the design surface. (Inherited from Part.)
Explicit interface implemetation Private property IControlBuilderAccessorControlBuilderFor a description of this member, see IControlBuilderAccessorControlBuilder. (Inherited from Control.)
Explicit interface implemetation Private method IControlDesignerAccessorGetDesignModeStateFor a description of this member, see IControlDesignerAccessorGetDesignModeState. (Inherited from Control.)
Explicit interface implemetation Private method IControlDesignerAccessorSetDesignModeStateFor a description of this member, see IControlDesignerAccessorSetDesignModeState. (Inherited from Control.)
Explicit interface implemetation Private method IControlDesignerAccessorSetOwnerControlInfrastructure. For a description of this member, see IControlDesignerAccessorSetOwnerControl. (Inherited from Control.)
Explicit interface implemetation Private property IControlDesignerAccessorUserDataFor a description of this member, see IControlDesignerAccessorUserData. (Inherited from Control.)
Explicit interface implemetation Private property IDataBindingsAccessorDataBindingsFor a description of this member, see IDataBindingsAccessorDataBindings. (Inherited from Control.)
Explicit interface implemetation Private property IDataBindingsAccessorHasDataBindingsFor a description of this member, see IDataBindingsAccessorHasDataBindings. (Inherited from Control.)
Explicit interface implemetation Private property IExpressionsAccessorExpressionsFor a description of this member, see IExpressionsAccessorExpressions. (Inherited from Control.)
Explicit interface implemetation Private property IExpressionsAccessorHasExpressionsFor a description of this member, see IExpressionsAccessorHasExpressions. (Inherited from Control.)
Explicit interface implemetation Private method IParserAccessorAddParsedSubObjectFor a description of this member, see IParserAccessorAddParsedSubObject. (Inherited from Control.)
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Remarks

When you create controls with Web Parts functionality, you have two basic options. You can create custom controls that derive from the WebPart class, or you can create or use other server controls. Existing ASP.NET controls, custom server controls, and user controls can all be given full Web Parts functionality by declaring them within (or adding them programmatically to) a WebPartZone zone control, with the result that they will be wrapped with GenericWebPart objects at run time and treated as true WebPart controls. For details, see the documentation for the GenericWebPart class. For speed of development and maximum reuse of code, using existing server controls can be a good option. For maximum programmatic control over the behavior and Web Parts functionality of controls, creating a custom control that inherits from the WebPart class is often the best option.

The abstract WebPart class inherits from the base Part control and provides the basic elements for all WebPart controls. The class includes a common set of properties that affect the appearance of the UI. The AllowClose, AllowConnect, AllowEdit, AllowHide, AllowMinimize, and AllowZoneChange properties each specify whether the user of a Web application is permitted to interact with the part control in the way indicated by the given property name. The CatalogIconImageUrl, ChromeState, ChromeType, Description, Height, HelpUrl, Hidden, Title, TitleIconImageUrl, TitleUrl, and Width properties determine the size, visibility, appearance, and supporting content (such as a title and a description) for a WebPart control.

The relationship of a WebPart control to its context within the Web Parts control set is determined by properties such as WebPartManager, which holds a reference to the control's associated WebPartManager object, and Zone, which references the WebZone that contains the control. There can be only one WebPartManager control per page, and each instance of a WebPart control can reside within only one WebZone at a time.

NoteNote

A WebPart control can be placed outside of a zone on a Web page, but in this case it functions as a normal server control and loses nearly all Web Parts functionality.

Several other important properties affect unique features of WebPart controls. The AuthorizationFilter property allows developers to set an arbitrary string that can be used as a filter at run time to determine whether a control is added to the page. Used together with a feature such as role management, the AuthorizationFilter property provides a useful mechanism for creating views based on defined user roles. The ExportMode property indicates whether, during an export, all the available property data on a control is exported, or only the non-sensitive data. This allows developers to distinguish between data that is sensitive and data that is not, for security purposes. The WebBrowsableObject property returns a reference to an instance of a WebPart control, so that an EditorPart control can edit it when the page is in edit mode. Finally, there are several properties that indicate the status of the control relative to the rest of the page. The IsClosed property indicates whether a control is closed (and thus added to a PageCatalogPart object), or if it is open and available on the page. The IsShared property indicates whether a control is a shared control (versus a user-specific control), meaning that it is visible to all users of a Web page. The IsStandalone property indicates whether a control is currently contained in a WebPartZoneBase-derived zone (such as WebPartZone). A value of false indicates the control is inside a zone and thus has full Web Parts functionality. The IsStatic property indicates whether a control is static or dynamic. A static control is declared in the markup of a Web page, whereas a dynamic control is added programmatically.

The WebPart class also provides several methods that determine what happens at various points in the control's life cycle. For example, the OnConnectModeChanged and OnEditModeChanged methods can both be overridden in a derived class to provide programmatic control over the rendering of a control's contents during the event that corresponds to each method's name.

Classes that derive from WebPart can add WebPartVerb objects to the Verbs collection. The verbs are rendered in a verbs menu, which appears in the title bar of a WebPart control. WebPartVerb objects provide simple UI elements for common user actions such as hiding or minimizing the control or displaying Help.

The CreateEditorParts method creates a collection of any custom EditorPart controls that are associated with a WebPart control. Developers can override this method so that it creates custom controls designed specifically to edit their WebPart control. The method is called when a user clicks the edit verb on a WebPart control.

Examples

The following code example demonstrates how to create a WebPart control and reference it in a Web page.

The first part of the example contains the code for a custom WebPart control named TextDisplayWebPart. This control demonstrates how to create a simple custom WebPart control that gives you access to the features of the Web Parts control set. For the code example to run, you must compile this source code. You can compile it explicitly and put the resulting assembly in your Web site's Bin folder or the global assembly cache. Alternatively, you can put the source code in your site's App_Code folder, where it will be dynamically compiled at run time. This code example assumes that you compile the source code into an assembly, place it in a Bin subfolder of your Web application, and reference the assembly with a Register directive in your Web page. For a walkthrough that demonstrates both methods of compiling, see Walkthrough: Developing and Using a Custom Web Server Control.

Imports System
Imports System.Security.Permissions
Imports System.Web
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts

Namespace Samples.AspNet.VB.Controls

<AspNetHostingPermission(SecurityAction.Demand, _
  Level := AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermission(SecurityAction.InheritanceDemand, _
  Level := AspNetHostingPermissionLevel.Minimal)> _
Public Class TextDisplayWebPart
    Inherits WebPart
    Private _contentText As String = Nothing 
    Private input As TextBox
    Private DisplayContent As Label


    Public Sub New() 
      Me.AllowClose = False 
    End Sub

    <Personalizable(), WebBrowsable()>  _
    Public Property ContentText() As String  
        Get 
            Return _contentText
        End Get 
        Set
            _contentText = value
        End Set 
    End Property 

    Protected Overrides Sub CreateChildControls() 
        Controls.Clear()
        DisplayContent = New Label()
        DisplayContent.Text = Me.ContentText
        DisplayContent.BackColor = _
          System.Drawing.Color.LightBlue
        Me.Controls.Add(DisplayContent)
        input = New TextBox()
        Me.Controls.Add(input)
        Dim update As New Button()
        update.Text = "Set Label Content" 
        AddHandler update.Click, AddressOf Me.submit_Click
        Me.Controls.Add(update)
        ChildControlsCreated = True 

    End Sub 


    Private Sub submit_Click(ByVal sender As Object, _
                             ByVal e As EventArgs) 
        ' Update the label string. 
        If input.Text <> String.Empty Then
            _contentText = input.Text & "<br />"
            input.Text = String.Empty
            DisplayContent.Text = Me.ContentText
        End If 

    End Sub 

End Class 

End Namespace
using System;
using System.Security.Permissions;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, 
    Level=AspNetHostingPermissionLevel.Minimal)]
  [AspNetHostingPermission(SecurityAction.InheritanceDemand, 
    Level=AspNetHostingPermissionLevel.Minimal)]
  public class TextDisplayWebPart : WebPart
  {
    private String _contentText = null;
    TextBox input;
    Label DisplayContent;

    public TextDisplayWebPart()
    {
      this.AllowClose = false;
    }

    [Personalizable(), WebBrowsable]
    public String ContentText
    {
      get { return _contentText; }
      set { _contentText = value; }
    }

    protected override void CreateChildControls()
    {
      Controls.Clear();
      DisplayContent = new Label();
      DisplayContent.BackColor = 
        System.Drawing.Color.LightBlue;
      DisplayContent.Text = this.ContentText;
      this.Controls.Add(DisplayContent);
      input = new TextBox();
      this.Controls.Add(input);
      Button update = new Button();
      update.Text = "Set Label Content";
      update.Click += new EventHandler(this.submit_Click);
      this.Controls.Add(update);
      ChildControlsCreated = true;
    }

    private void submit_Click(object sender, EventArgs e)
    {
      // Update the label string. 
      if (input.Text != String.Empty)
      {
        _contentText = input.Text + @"<br />";
        input.Text = String.Empty;
        DisplayContent.Text = this.ContentText;
      }
    }
  }
}

The second part of the example shows how to reference the TextDisplayWebPart control in an ASP.NET Web page. Notice that many of the various WebPart properties can be assigned declaratively to the custom control.

<%@ page language="VB" %>
<%@ register tagprefix="aspSample" 
             Namespace="Samples.AspNet.VB.Controls" 
             Assembly="TextDisplayWebPartVB"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
  <form id="Form1" runat="server">
    <asp:webpartmanager id="WebPartManager1" runat="server" />
    <asp:webpartzone
      id="WebPartZone1"
      runat="server"
      title="Zone 1"
      PartChromeType="TitleAndBorder">
        <parttitlestyle font-bold="true" ForeColor="#3300cc" />
        <partstyle
          borderwidth="1px"   
          borderstyle="Solid"  
          bordercolor="#81AAF2" />
        <zonetemplate>
          <aspSample:TextDisplayWebPart 
            runat="server"   
            id="textwebpart" 
            title = "Text Content WebPart" />
        </zonetemplate>
    </asp:webpartzone>
  </form>
</body>
</html>
<%@ page language="C#" %>
<%@ register tagprefix="aspSample" 
             Namespace="Samples.AspNet.CS.Controls" 
             Assembly="TextDisplayWebPartCS"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>ASP.NET Example</title>
</head>
<body>
  <form id="Form1" runat="server">
    <asp:webpartmanager id="WebPartManager1" runat="server" />
    <asp:webpartzone
      id="WebPartZone1"
      runat="server"
      title="Zone 1"
      PartChromeType="TitleAndBorder">
        <parttitlestyle font-bold="true" ForeColor="#3300cc" />
        <partstyle
          borderwidth="1px"   
          borderstyle="Solid"  
          bordercolor="#81AAF2" />
        <zonetemplate>
          <aspSample:TextDisplayWebPart 
            runat="server"   
            id="textwebpart" 
            title = "Text Content WebPart" />
        </zonetemplate>
    </asp:webpartzone>
  </form>
</body>
</html>
Version Information

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
Platforms

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.